Photographic shutter



Jan. 22 1924.

W. A. RIDDELL PHOTOGRAPHIC SHUTTER Filed y 25. 1923 2 Sheets-Sheet 2 M mm m 14 5 [(11 Q Hi /7. [Zia/4(sll 215A TTORNEY Patented Jan. 22, 1924.

UNITED STATES 1,481,271 PATENT OFFICE.

WILLIAM A. RIDDELL, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAKCOMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PHOTOGRAPHIC SHUTTER.

Application filed May 25, 1923. Serial No. 641,384.

To all whom it may concern.-

Be it known that I, WILLIAM A. RIDDELL, a citizen of the United Statesresiding at Rochester, in the county of Monroe and State of New York,have invented certain new and useful Improvements in PhotographicShutters; and I do hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, forming a part of this specification, and to the re erencenumerals marked thereon.

My present invention relates to photography and more particularly tophoto graphic shutters of the pivoted blade symmetrical opening type andit has for its object to provide a simple and eflicient blade actuatingmechanism that Wlll be light but durable and that will at the same timegreatly facilitate the assembling of the shutter. To these and otherends the invention resides in certain improvements and combinations ofparts all as will be hereinafter more fully described, the novelfeatures being pointed out in the claims at the end of thespecification.

In the drawings: Figure 1 is a plan view of the blade mechanism of ashutter constructed in acso cordance with and illustrating oneembodiment of my invention, the cover plate of the shutter casing beingremoved as well as the operating mechanism of the shutter.

Figure 2 is a similar v1ew of the blades as with overlying parts removedFigure 3 is an enlarged section on the line 33 of Figure l.

Figure 4 is an enlarged section on the line 4-4 of Figure l. L0 Figure 5is a front view of the blade ring in lace but with the blades removed.

' igure 6 is a similar view of the bottom of the shutter case with theblades and blade ring removed.

Figure 7 is a rear view of the shutter.

Figure 8 is an enlarged detail section on the line 8-8 of Figure 5.

Figure 9 is a rear view of the blade ring detached and Figure 10 is asection through the shutter case on the line 1010 of Figure 1.

Similar reference numerals throughout the several views indicate thesame parts.

The shutter case 1 is of the usual type although the threaded attachingcollar 2 .in the present instance by embossing the see Figure 10 isshown to be made as a separate piece having an external flange 3 bearinagainst the bottom 4 of the case and suitab y attached thereto and aninternal flange 5 forming a bearin for the blade ring as hereinafterdescribed.

This blade ring, indicated at 6, lies on the flange 5 which iscounterbored at 7 to make a better bearin and turns within the centralopening 8 of t e case bottom 4 being preferably flush therewith as shownin figure 10. It may consist of a light metal stampi havin a rearwardlyor downwardly turn centra flange 11 that bears on the inner edge of theflange 5 of the attachin collar 2. This flange 11 is formed with a puralit of outwardly turned ears or In 9 that 00k beneath the flange 5and hofd the rin to the latter. The lade rin is assembl in sosition byaligning the ugs 9 with and ropping them through a plurality ofsimilarly spaced notches 10 in the fla 5 as best shown in Figures 6 and7. on in alignment with the notches the lugs are not in normal positionand therefore a partial rotation of the ring to normal position locksthe parts together. The operative movement of the ring is so slight asnot to carry the lugs 9 back to the notches 10 during the operation ofthe shutter. It will thus be seen that the ring is very to assemble; issmaller and lighter than t e blade rings usually used and yet has a firmand free bearing on the shutter case.

The manner in which the blade ring actuates the blades is best shown inFigures 2 and 5. The bottom 4 of the case is provided with a pluralityof recesses 12 at mtervals about the opening 8 which recesses are formedsheet metal of which the case is formed. Adjacent to each recess is afixed ivot pin 13 about which one of the shutter lades 14 turns on aforked bearing 15. The blades shown are of a known form and theirgeneral character is not important to this invention. The blade ring 6is provided with a plurality of outwardly or radially projecting lugs 16the swing of which is accommodated within the depressions 12. Suitablepivot members 17 on these lugs cooperate with bearings in the respectiveblades that cause the latter to swing between the open positions ofFigure 2 and the closed positions of Figures 7 and 10 with the oscillanotions of the blade ring in the accustomed manner. One of these pivotmembers marked 17*' is extended upwardly higher than the rest tocooperate with an actuator 18 turnin on a pivot 19 and forming part ofthe s utter operating mechanism--not shown and immaterial to the presentinvention. As the actuator 18 is oscillated see Figure 1 it oscillatesthe blade ring 6 and so aifects the blades.

The blades 14 are confined between the bottom 4 of the case and apartition member 20 that is suitably spaced by attaching lugs 21fastened by screws 22 and provided with suitable radial slots 23 for thesliding pins of the usual type of iris diaphragm used with such shuttersbut not herein otherwise shown. Such plate 20 is cut away to receive theblade pivots 13 at 24 and slotted at 25 to accommodate the blade ringpivot members 17 and 17.

I claimas my invention:

1. In a photographic shutter, the combination with a shutter case havinga lens opening therein and shutter blades -fulcrumed on the case, of ablade actuating ring turning on the case within the opening and havingan oscillatory operative movement, said ring being interlocked with thecase by a rotary movement of greater magnitude than its operativemovement.

2. In a photographic shutter, the combination with a shutter case havinga lens opening therein and shutter blades fulcrumed on the case, of ablade actuating ring turning on the case within the opening and havingan oscillatory operative movement, the ring and case bemg interlocked byrelative rovided with interlocking lugs adapted to be inserted in orwithdrawn through the notches and operating to hold the ring to thecase.

4. In a hotographic shutter, the combination wit a shutter case having alens openinglprovided with an inwardly turned flange aving notchestherein and shutter blades fulcrumed on the case, of a blade actuatingrin having a flanged portion cooperating with the flan e of the case andprovided with outwardly turned lugs interlocked with the latter b beinginserted through the notches and t e ring then partially rotated, thering having an oscillatory operative movement of less magnitude than itsinterlocking movement.

5. In a hotograhpic shutter, the combination wit a shutter case having alens opening therein and shutter blades fulcrumed on the case, of ablade actuating ring turning on the case within the open ing, saidmembers being respectively provided with coo crating recesses andprojections for inter ocking the blade ring with the case by relativerotary movement.

WILLIAM A. RIDDELL.

